Vacuum-jacketed gauge glass



lmoos M. GQODLOE' VACUUM JAGKETED GAUGE GLASS Dec. 7 i926.

Filed August e. 1923 [/vr/ENTOR Meda/e ,Good/oe,

@j/@QM TTORNEKS'.

flgatented Dec. 7, 1926.

naires stares teiaee PATENT-foreros.

Manna soonLon'or `Los ANGELES, CALIFORNIA.

yVACUUMYJACKETE!) GAUGE GLASS. A

lThe general object of my invention is to" provide a gauge ol' the character stated corn- ;uising means for preventing the formation frost on the gauge tube and whereby said tube is maintained visible, so that itmay be read. Y

l particular object is to provide a as above described comprisingA a by exhaustion)surrounding the gauge whereby frost is prevented from form'- ing on the gauge tube. Y

A further objectia to provide a refrigerating gauge comprising'a liquid gauge vessel, which may be in the form of a tube, a transparent vacuum vessel which may also be in the Aform of 'a tube' surrounding and formed integral with said gauge tube, to prevent formation of frost on said gauge tube, and resilient means for allowing expansion and contraction ofsaid gauge tube with relation to said vacuum tube.

VFurther objectsfand advantages will be made evident hereinafter.

Referring to the .drawing which is for illustrative purposes only.

Fig, 1 is a vertical longitudinal section of a refrigerating gauge embodying my invention.

talen on line 2-2 of Fig. 1.

1g. 3 is enlarged detail view showing a section which may be regarded as followcribed.

s 50 ln the drawine 1 indicates a Gau e tube' ai V e; a

2 'i 3 upper and lower valves respectively coupled to the lower and upper ends ot said isparent vacuum tube (i. e., a tube inY i nchthe residual Ons 1s considerably rare-k llig. 2 is a horizontal section' of my gauge ine the curvatures of a helix, as hereinafter on aV vertical nipple 8 formed on each valve and the head 9 of which collar engages the endo-f said nipple, and theouter edge ofa collar 10 surrounding one end of the gauge tube 1 and litting within-a recess 11 in said nipple. Eachrvalve 2 `and 3 com:

prises a seat 12 and a, screw .valve memberk lffor engaging said seat to closetlie valve, by means of which valves the liquid may be manually shut off from the'gauge tube for changing the tube. Each valve 2 and 3 also includes a check valvel, which check valve comprises a seat 15V and a ball 16 for engaging said seat tof close the valve,l to

Aautomatically shut off the liquid in case of breakage of the gauge tube. The valves 2 land 3 are formed with rearwardly extend-V ing conduits 17 and 18 which connect respectively at diiiierent heights to therefrigerating receptacle V2O.v f

A vacuum tube 21 constituting` a'transparent means of thermal insulation lsuirounds the gauge tube 1 and is formed in'- tegral at its ends with said auge tube near the ends respectively of the vlatter tube. The gaugetube is restricted for a shorty distance in the form of a tubular helix 22 within the upper end of the vacuum tube 21, which restricted helix forms resilient means for allowing expansion and lcontraction' of the gauge tube 1 with relation to the vacuum tube 21,. The air being exhausted from the vacuum tube 21, freezing of atmospheric moisture on the outside of a gauge 1, and the deposit of frost on said tube, is thereby prevented. The rareficatio-n of the medium between vthe glasses prevents moisture from lcollecting on the inner .tube and the liquid within the gauge tube 1 is maintained visible through said tube andthe vacuum tube 21, thus enabling` the gauge to be read and the amount of refrigerati-ng liquid in the refrigeratingl receptacle determined under all con-y ditions of temperature.

The valves 2 and 3 and the adjoining ends 'of the gauge tube 1 and vacuum tube 21 are enclosed within jackets 23 and 24 of heat and cold insulatingv material such as corlnj each of which jackets being split longitudinally as indicated at 25 so that it may be readily applied to or removed from the parts of the gauge which it covers, tends partially around the front and sides of the tubes 21 and 1 between the Vjackets 23 and 24, said cage comprising lower and upper.'

U-shaped members 27and28 respectively se- A cage 26 eX- cured to the upper and lower ends of the jaeketsQS iicl Q4 Yand Vertio'al rods vQ9 secured respectively at their lower and upper ends in seid U-shaped members 27 and 2S in 'front of and at thesicles of the Vaouuin tube 2l and gauge tube l to protect said tubes.

I claim as my invention:

l. A gauge or'rerigerating apparatus iw eluding a gauge tube for showing the retrigereting liquid, an outer transparent tubo surrounding said gauge t-ube and formeel integral et its ends with said gauge tube, the

nir beingl exhausted from seidv outer tube to prevent formation of rost on either oi said tubes7 and said gauge tube being restricted fore short portion ot its length and shaped to allowl for relative expansion and contrae tion of seid tube with relation to seid. outer tube.

A gauge for refrigerating apparat-usV including a gauge tube for showing the refrigeiating liquid; a transparent outer tube surrounding said gauge tube and formed integral with said gauge tube7 the air being exheusted Y from Said' outer tube to prevent formation of frost on either of seid tubes, and seid gauge tube beine' orinecl with :i helieelb7 coiled tubular portion to allow for expansion and contraction of said gauge tube with relation to said outer tube.

n testimony whereof, have herei1 set my hand at Los Angeles, Califeinjizi, this 30th day of July, 1928.

Y MEADE GOODL- 

